N-point correlation functions determined from the N_side = 64Planck CMB 2015 temperature estimates. Results are shown for the 2-point, pseudo-collapsed 3-point (upper left and right panels, respectively), equilateral 3-point, and connected rhombic 4-point functions (lower left and right panels, respectively). The brown three dot-dashed, purple dashed, and red dot-dashed lines correspond to the Lkl-Commander map analysed using the low-ℓ and common masks and the Commander map analysed using the common mask, respectively. Note that the dashed and dot-dashed lines lie on top of each other. The black solid line indicates the mean for 1000 MC simulations. The shaded dark and light grey regions indicate the 68% and 95% confidence regions, respectively, estimated using 1000 Commander simulations. See Sect. 4.3 for the definition of the separation angle θ.